Think about it, paint wheels with weights in place, then later get a tire balance, and guess what, non painted areas!
Look for the many posts on painting the stock wheels, many guys carefully remove and mark the position of the weights, paint both wheels and weights then replace weights in the original spots. Or, I just had the guys balance from the inside of the wheels on my last tire rotation/balance, which would be better for you so you would not mare your newly painted finish on the outside of the rims.